Since you are using a subdomain, your custom domain will look like
https://schedule.yourbusiness.com
.Log in to your Strato account and select your domain.
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Click on the Manage domains card.
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Click on the Settings icon on the top right corner of the domain you want to configure.
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On the next page, go to the DNS tab and click on the Manage button beside the TXT and CNAME records, including SPF and DKIM settings.
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Fill the Prefix, Type and Value fields with the values seen on the NeetoCal custom domains dashboard.
Once the values have been filled, click on the Accept Setting button.
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For more information refer the official documentation.